Gold fell more than 1 percent Thursday, extending the previous session's losses, after the CME Group (CME.O) raised trading margins by the most in more than two and a half years to curb volatility.

Spot gold dropped by more than 4 percent Wednesday, its biggest drop since December 2008, as investors liquidated positions after the precious metal surged nearly 35 percent this year to a record high above $1,911 on Tuesday.

CME increased margin requirements on its gold futures contract by 27 percent, the second hike in a month, following similar moves by the Shanghai Gold Exchange and Hong Kong Mercantile Exchange earlier this month.

Data suggesting the U.S. economy was facing a slowdown instead of a recession also took the shine off safer assets like gold.

A lot of hot money has entered the complex, and the rally was done too much in too short a time, David Thurtell, an analyst at Citigroup, told Reuters.

Last 24 hours there was definitely profit-taking. With the margin hike, if speculators don't have the money to pull out as extra margin they'll just cut their positions. That contributed to the liquidation.

Spot gold slipped as much as 1.3 percent to $1,728.59 an ounce, before recovering some ground to trade at $1,739.80 by 2:17 a.m. EDT. On Wednesday, bullion dropped 4.3 percent, its biggest daily drop since December 1, 2008.

U.S. gold fell 0.8 percent to $1,742.90, after dropping 5.6 percent on Wednesday, the steepest daily drop since March 2008.

Helping fuel Wednesday's sell-off was data showing new orders for long-lasting U.S. manufactured goods rose more than expected in July, offering hopes that the ailing economy could dodge another recession and boosting risk appetite across markets.

Before this week's drop, bullion had surged more than $400 since July and scored consecutive record highs as a struggling U.S. economy and crippling debt crisis in Europe boosted gold's safe-haven appeal.

Spot gold has lost more than 8 percent from its all-time high. The price surged nearly 10 percent in the six-day climb before the decline.

NOT SAFE ANYMORE?

People always refer to gold as safe haven. When we introduce volatility to the equation, it doesn't seem so safe anymore, said a Singapore-based trader, but added that gold's luster looks intact.

Many leveraged longs are going to leave it alone for a while. And when prices come down like this, it might be a buying opportunity for real money account like central banks.

Technical charts suggest that a medium-term uptrend for gold is intact even after the sharp drop over the past two sessions, with a rebound likely to push it to $1,784, said Reuters market analyst Wang Tao.

Holdings in the SPDR Gold Trust dropped 2.2 percent on the day to 1,232.314 tonnes by August 24, its lowest in more than a month and down 6 percent from a one-year high of 1,309.922 tonnes hit on August 8.

ANZ has raised its forecast for gold prices, expecting prices to peak at $2,200 in the second quarter of 2012, from a previous forecast of $1,800.

The substantial revision has been propped up by an unusual lack of support for the U.S. dollar under the current uncertain financial market conditions - effectively channeling stronger than normal safe-haven flows to gold, said ANZ analysts in a research note.

(Reporting by Rujun Shen and Manolo Serapio Jr.; Editing by Himani Sarkar)